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Passage illustrated

"This is where young McFarlane must have come out to get his hat after the crime was done," said he. "Now look at this." With dramatic suddenness he struck a match, and by its light exposed a stain of blood upon the whitewashed wall. As he held the match nearer, I saw that it was more than a stain. It was the well-marked print of a thumb.

"Look at that with your magnifying glass, Mr. Holmes."

"Yes, I am doing so."

"You are aware that no two thumb-marks are alike?"

"I have heard something of the kind."

"Well, then, will you please compare that print with this wax impression of young McFarlane's right thumb, taken by my orders this morning?"
As he held the waxen print close to the blood-stain, it did not take a magnifying glass to see that the two were undoubtedly from the same thumb. It was evident to me that our unfortunate client was lost.

"That is final," said Lestrade.

"Yes, that is final," I involuntarily echoed.

"It is final," said Holmes.

Something in his tone caught my ear, and I turned to look at him. An extraordinary change had come over his face. It was writhing with inward merriment. His two eyes were shining like stars. It seemed to me that he was making desperate efforts to restrain a convulsive attack of laughter.

References

Doyle, Arthur Conan. The Original Illustrated Sherlock Holmes. “Reproduced from the original publication in The Strand Magazine with the classic illustrations by Sidney Paget.” Edison, New Jersey: Castle Books, [after 1954]. Internet Archive version of a copy donated by Friends of the San Francisco Library. Web.